Girls playing with their hair, flirting?

I recently observed that girls that I talk to will usually play with their hair. These are girls that are both single and are in relationships. They will sometime:

1. Twirl the end of their hair.

2. Loosen their hair and pass their hand through it.

3. Re styling their hair.

Is this a flirting or normal behavior. Thank you.
Girls playing with their hair, flirting?
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